Telecommunications — page 83 of 85

8,405 terms including subtopics (8,400 terms filed directly here)

Telecommunications terms

  1. Virtual Private Network (VPN) A virtual private network is a logical network that is established, at the application layer of the Open Systems Interconnection (OSI) model, over an…
  2. virtual reality An interactive, computer-generated simulated environment with which users can interact using specialized peripherals such as data gloves and head-mounted…
  3. virtual storage The storage space that may be regarded as addressable main storage by the user of a computer system in which virtual addresses are mapped into real…
  4. virtual terminal (VT) In open systems, an application service that (a) allows host terminals on a multi-user network to interact with other hosts regardless of terminal type…
  5. virtual tributary (VT) A structure designed for transport and switching of sub-STS-1 payloads. There are currently four sizes of VT. [T1.105-1988]
  6. virtual workplace Synonym virtual office.
  7. virtual world A simulated environment that appears to have the characteristics of some other environment, and in which participants perceive themselves as interactive…
  8. Virus (VY-rus) In medicine, a very simple microorganism that infects cells and may cause disease.
  9. virus signature A unique bit string that is common to each copy of a particular virus and that may be used by a scanning program to detect the presence of the virus.
  10. visible spectrum The region of the electromagnetic spectrum that can be perceived by human vision, approximately the wavelength range of 0.4 m to 0.7 m.
  11. visual channel A means for delivering video frames from one point to another; a sequence of frames submitted to the channel input results in a similar (not necessarily…
  12. visual display unit (VDU) See monitor.
  13. visual telephone services A group of audiovisual services including videophone as defined in ITU-T Recommendation F.
  14. vitreous silica Glass consisting of almost pure silicon dioxide (SiO2). Synonym fused silica.
  15. VLF Very Low Frequency.
  16. VNL Abbreviation for via net loss.
  17. vocoder Abbreviation for voice-coder. A device that usually consists of a speech analyzer, which converts analog speech waveforms into narrowband digital signals…
  18. vodas Acronym for voice-operated device anti-sing. A device used to prevent overall voice-frequency singing in a two-way telephone circuit by ensuring that…
  19. vogad Acronym for voice-operated gain-adjusting device. A device that has a substantially constant output amplitude over a wide range of input amplitudes.
  20. voice band Synonym voice frequency.
  21. voice coder See vocoder.
  22. voice frame A UIH (unnumbered information with header check) frame that contains a voice packet in its information field. [T1.312-1991]
  23. voice frequency (VF) Pertaining to those frequencies within that part of the audio range that is used for the transmission of speech.
  24. voice frequency (VF) primary patch bay A patching facility that provides the first appearance of local-user VF circuits in the technical control facility (TCF).
  25. voice frequency carrier telegraph (VFCT) Synonym voice-frequency telegraph.
  26. voice grade In the public regulated telecommunications services, a service grade that is described in part 68, Title 47 of the Code of Federal Regulations [CFR].
  27. voice information field The field within a voice packet that contains blocks arranged according to the significance of the bits: the first block contains the most significant…
  28. voice operated relay circuit Synonym vox.
  29. voice operated transmit Synonym vox.
  30. voice-data signal See quasi-analog signal.
  31. voice-frequency (VF) channel A channel capable of carrying analog and quasi-analog signals.
  32. voice-frequency telegraph (VFTG) A method of multiplexing one or more dc telegraph channels onto a nominal 4-kHz voice frequency channel. Synonym voice frequency carrier telegraph.
  33. voice-operated device anti-sing See vodas.
  34. voice-operated gain-adjusting device See vogad.
  35. voice-plus circuit Synonym composited circuit.
  36. volatile storage A storage device in which the contents are lost when power is removed.
  37. Volatility The term volatility indicates how much and how quickly the value of an investment, market, or market sector changes.
  38. Volt-amperes reactive (VARS) The unit of measure for reactive power.
  39. voltage rating The highest voltage that can be applied to a wire or conductor in conformance with standards.
  40. voltage standing wave ratio (VSWR) In a transmission line, the ratio of maximum to minimum voltage in a standing wave pattern.
  41. Volume Volume is the number of shares traded in a company's stock or in an entire market over a specified period, typically a day.
  42. volume unit (vu) A unit of measurement of the power of an audio-frequency signal, as measured by a vu meter.
  43. VOX Voice Actuation.
  44. VSB Visible Satellite Imagery
  45. VSWR Abbreviation for voltage standing wave ratio.
  46. vu Abbreviation for volume unit.
  47. Vulnerability Weakness in an information system, system security procedures, internal controls, or implementation that could be exploited or triggered by a threat…
  48. Vulnerability Assessment Formal description and evaluation of the vulnerabilities in an information system.
  49. VW-1 Flammability rating established by Underwriters Laboratories for wires and cables that pass a specially designed vertical flame test formerly designated…
  50. W-profile fiber Synonym doubly clad fiber.
  51. Wafer A thin sheet of semiconductor (photovoltaic material) made by cutting it from a single crystal or ingot.
  52. WAIS Acronym for Wide Area Information Servers. A distributed text searching system that uses the protocol standard ANS Z39.
  53. wallpaper A graphic image that serves as a background for a Web page or for a computer operating system's screen.
  54. WAN Wide Area Network (Telecomm/Computer term).
  55. wander Relative to jitter and swim, long-term random variations of the significant instants of a digital signal from their ideal positions.
  56. warm boot Synonym warm restart.
  57. warm restart A sequence of operations that is performed to reset a previously running system, after an unintentional shutdown. Synonym warm start. 2.
  58. warm start Synonym warm restart.
  59. Warner exemption A statutory exemption pertaining to the acquisition of telecommunications systems that meet the exclusionary criteria of the Warner Amendment, Public Law…
  60. watermark A translucent mark in paper incorporated during manufacture for purposes of identification or protection of a document A mark that is imprinted on a…
  61. WATS Wide Area Telephone System.
  62. wave equation See Maxwell's equations.
  63. wave impedance At a point in an electromagnetic wave, the ratio of the electric field strength to the magnetic field strength.
  64. wave trap A device used to exclude unwanted frequency components, such as noise or other interference, of a wave.
  65. waveform The representation of a signal as a plot of amplitude versus time.
  66. wavefront The surface defined by the locus of points that have the same phase, i.e., have the same path length from the source.
  67. waveguide A material medium that confines and guides a propagating electromagnetic wave. Note 1: In the microwave regime, a waveguide normally consists of a hollow…
  68. waveguide dispersion See dispersion.
  69. waveguide scattering Scattering (other than material scattering) that is attributable to variations of geometry and refractive index profile of an optical fiber.
  70. Wavelength The distance between one peak or crest of a wave (of light, heat, or other energy) and the next corresponding peak or crest.
  71. wavelength stability Of an optical source during a specified period, the maximum deviation of the peak wavelength from its mean value.
  72. wavelength-division multiplexing (WDM) In optical fiber communications, any technique by which two or more optical signals having different wavelengths may be simultaneously transmitted in the…
  73. WDM Wavelength Division Multiplexon .
  74. weak bit A bit intentionally written on a diskette with a weak magnetic field strength that may be interpreted as zero or one and that is written as part of a…
  75. weakly guiding fiber An optical fiber in which the refractive index contrast is small (substantially less than 1%).
  76. Web See World Wide Web.
  77. Web browser Software installed on the Internet user's computer that allows him or her to view web pages.
  78. Web crawler A class of robot software that explores the Web by retrieving a Web document and following the links within that document.
  79. Web document An HTML (hypertext markup language) document available on the World Wide Web. [Bahorsky]
  80. Web node Synonyms Web site, Web server.
  81. Web page An yyHTML document accessible on the World Wide Web. [Bahorsky] Note: The number and types of features that can be offered on a web page is growing almost…
  82. Web page search engine Loosely synonymous with portal. See droid.
  83. Web phone See Internet phone.
  84. Web ring A confederation of (usually linked) Web sites that serve a particular special interest group or that have similar or related content. [Bahorsky]
  85. Web server A computer that hosts Web pages and responds to requests from browsers. Also known as an HTTP server, a Web server stores files whose URLs begin with…
  86. Web site A collection of Uniform Resource Indicators (URIs, including URLs (Uniform Resource Locators)) in the control of one administrative entity.
  87. Web spider Synonym droid. See also spider.
  88. Web surfer Synonym cybernaut. See also droid.
  89. Web television The concept of providing Internet access (usually Web access and e-mail) in a format that can be viewed on a standard television set rather than on the…
  90. Webmaster A person or group of people responsible for the design, implementation, management, and maintenance of a Web site.
  91. Webspace The virtual space created by the World Wide Web or a subset of that space occupied by a particular Web site. [After Bahorsky]
  92. webzine See e-zine.
  93. weighted standard work second A measurement of traffic operating work which is used to express the relative time required to handle the various kinds of calls or work functions, and…
  94. weighting network A network having a loss that varies with frequency in a predetermined manner, and which network is used for improving or correcting transmission…
  95. whip antenna A flexible rod antenna, usually between 1/10 and 5/8 wavelength long, supported on a base insulator.
  96. white area The area or population which does not receive interference-free primary service from an authorized AM station or does not receive a signal strength of at…
  97. white clip The maximum system-permissible excursion of the video signal in the white direction. [After SMPTE]
  98. white compression In television technology, the reduction of gain applied to light areas in picture signal (corresponding to the midrange light value in the picture).
  99. white facsimile transmission In an amplitude-modulated facsimile system, transmission in which the maximum transmitted power corresponds to the minimum density, i.e.
  100. White noise Random energy containing all frequency components in equal proportions.

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